Fix missing RollingStock cases in contribution system

### Overview
Fixed unhandled match case error when approving RollingStock contributions by adding support in AdminContributionController and UserContributionReq model

### Key Changes
- [Add detailed changes here]

### Technical Implementation
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### Impact
- [Add impact assessment here]

### Gambaran Umum
[Indonesian translation of description]

### Perubahan Utama
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### Implementasi Teknis
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### Dampak
- [Tambahkan penilaian dampak di sini]